WO2005080806A1 - Nut retaining - Google Patents

Nut retaining Download PDF

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Publication number
WO2005080806A1
WO2005080806A1 PCT/GB2005/000294 GB2005000294W WO2005080806A1 WO 2005080806 A1 WO2005080806 A1 WO 2005080806A1 GB 2005000294 W GB2005000294 W GB 2005000294W WO 2005080806 A1 WO2005080806 A1 WO 2005080806A1
Authority
WO
WIPO (PCT)
Prior art keywords
arrangement
strip
component
cross
forms
Prior art date
Application number
PCT/GB2005/000294
Other languages
French (fr)
Inventor
Cedric Brett Harper
Jeffrey Charles Bishop
Original Assignee
Rolls-Royce Plc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to GB0403686A priority Critical patent/GB0403686D0/en
Priority to GB0403686.9 priority
Application filed by Rolls-Royce Plc filed Critical Rolls-Royce Plc
Publication of WO2005080806A1 publication Critical patent/WO2005080806A1/en

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS, WEDGES, JOINTS OR JOINTING
    • F16B39/00Locking of screws, bolts or nuts
    • F16B39/02Locking of screws, bolts or nuts in which the locking takes place after screwing down
    • F16B39/10Locking of screws, bolts or nuts in which the locking takes place after screwing down by a plate, spring, wire or ring immovable with regard to the bolt or object and mainly perpendicular to the axis of the bolt
    • F16B39/101Locking of screws, bolts or nuts in which the locking takes place after screwing down by a plate, spring, wire or ring immovable with regard to the bolt or object and mainly perpendicular to the axis of the bolt with a plate, spring, wire or ring holding two or more nuts or bolt heads which are mainly in the same plane

Abstract

A nut retaining arrangement (21) is provided whereby a strip (22) has a ladder disposition with cross-forms (23) upon which nuts (31) are retained. Either side of the cross-forms (23), web portions (25) act to reinforce the arrangement to torque loads presented to the retained nut (31). The strip (22) has lip sections (26) and grooves (27) to allow sufficient flexibility for conformity with a casing but with resistance to twist and buckle. Normally, a retainer member (30) is located and secured across the cross-form (23). This retainer member may be secured through apertures (35) using tangs (36) formed in the strip (22).

Description

NUT RETAINING

The present invention relates to nut retaining and more particularly to nut retaining used with regard to the nuts used for securing components in gas turbine engines. Figure 1 is a schematic cross-section of an anchor nut retention feature typically used with regard to providing a nut 2 upon which a screw/bolt 3 is used to retain a first component on a second component 4. To prevent rotation of the nut 2, a retainer 5 is riveted by rivets 6 to the second component. Each retainer 5 requires two rivets 6 for stability and surety of location. Each rivet 6 requires a hole to be drilled and then the end of that hole on the first component side of the second component must be counter-sunk 7 to prevent fouling with the first component in operation. The first component may be a guide vane, an acoustic panel, an infill panel or a bracket, and the second component may be a casing. In the above circumstances, it will be appreciated that provision of nut retaining arrangements is time consuming and fraught with hazards. Typically, it can take up to eight hours for one ring of retainers to be located excluding delays for broken tools and corrections to mistakes necessary due to the relatively high cost of these components . Where the second component, the casing, is of sufficient thickness, the nuts can be retained by staked inserts keyed into apertures formed in the second component, the casing, but these are expensive and require formation of the inserts and reciprocal keyed apertures . In accordance with the present invention there is provided a retainer arrangement for retaining association between components, the arrangement comprising a strip with cross-forms and web portions adjacent those cross-forms to reinforce respective cross-forms whereby the strip can be secured in use about a component with cross-forms available to retain a nut to prevent rotation. Preferably, the strip has a ladder configuration. Normally, the strip has shallow lips between web portions. Typically, grooves are provided in the strip to facilitate bending and conformity in use to the component . Typically, the web portions are bent upwarclly whereby they extend away from the component in use . Preferably, each cross-form includes an anchor nut base plate. Typically, the retainer member is a plate or tag with means to prevent in use rotation of a nut. Generally, each retainer member is respectively located in at least one under-cut slot formed in one of the web portions _ Normally, each retainer base plate is located and secured between under-cut slots in adjacent web portions. Advantageously, each base plate is secured by tangs formed in the strip . These tangs extending through apertures in the retainer member. Normally, the tangs are bent-over in the apertures. Typically, the tangs are associated with the >ase plate. Possibly, that association is by brazing or peening. Normally, ends of the strip in use are secured together about the component to maintain association between the arrangement and the component. Possibly, the encϋs are butt welded together or the ends overlap with overlapping cross- forms whereby a retained nut upon a bolt/screw wiZLl hold the ends together. Alternatively, the arrangement depends in use upon associations between the nuts retained and bolts/screws to maintain association between the arrangement and the component . Typically, the arrangement secures the first component to a further component. Possibly, the component or the further components are a guide vane or a fan casing or acoustic panel or infill panel. An embodiment of the present invention will now be described by way of example only with reference to the accompanying drawings in which: - Figure 2 is a plan view of part of a nut. retaining arrangement; and, Figure 3 is a side view of the nut retaining arrangement depicted in figure 2. Figures 2 and 3 illustrate a nut retaining arrangement 21 in accordance with the present invention. The arrangement 21 comprises a strip 22 which is of a ladder- like disposition with cross-forms 23 separated by strip apertures 24. Between the cross-forms 23 there are web portions 25 which act to reinforce the cross-forms 23. These web portions develop into shallow lip segments 26 which in turn are spaced by grooves 27. The lip segments 26 act to resist buckling of the strip 22. The grooves 27 allow the strip to bend and conform in use to a casing/second component . The cross-forms 23 provide a platform with an aperture through which the bolt/screw projects but more importantly acts as a rotation trap for the anchor nut of the arrangement 21. The nut is secured to the bolt/screw upon assembly of the first component, vane, to the second component, casing. In such circumstances, the cross- form 23 must be able to resist torque during assembly, as illustrated, web portions 25 are located either side of the cross-forms 23 for reinforcement. These web portions 25 are generally upturned edges of the strip 22 appropriately shaped for resilience. It is important that the present arrangement 23. is in close conformity with the casing/second component. Thus, the web portions 25 are only provided over a limited length or arc of the strip 22 to allow bending and such confor~mity to the casing or second component. It will be understood that the web portions 25 present significant resistance to bending due to their upturned nature and general reinforcement of the cross-member 23. The grooves 27 allow bending and pivot thereabout to facilitate conformity to the casing or second component shape. Nevertheless, it is necessary to provide lip segments 26 which are shallower than the web portions 25 but still provide resistance to buckling and twisting of the strip 22. The lip segments 26 are upwardly extending generally away from the casing or second component when formed to provide a buttressing rib. It will also be seen that connection sections 29 are provided either side of the strip apertures 24 "to give further resistance to torque loads presented to the arrangement 21. A balance must be struck between the provision of lip segments 26 and/or connection sections 29 for buckle resistance and flexibility for conformity to the casing or second component in use. The grooves 27 provide pivot bend locations for conformity but the sections of strip 22 between these grooves 27 must also bencl slightly if there is to be close conformity to the casing or second component shape . It is prevention of anchor nut rotation -which is the principal purpose of the present arrangement 21 and in particular the cross-form 23. It will be understood that substantial loads may be presented to the nut through the screw/bolt but acceptable material thicknesses and type for the strip will be limited by the necessity for bend and conformity. Thus, the cross-form 23 generally must be reinforced by web portions 25. The anchor nut base plates 30 are norτnally shaped plates with rounded pointed ends 32 which sit in location with undercut slots 33 in the web portions 25. Thus, the plates 30 are constrained laterally, longitxidinally and vertically by slots 33 for appropriate location with an aperture 34 to receive a bolt/screw. Such location may be sufficient for operational purposes but normally locking apertures 35 are formed in the pointed ends 32 through which tangs 36 extend to secure the plates 30. The tangs 36 are bent over and usually associated with theizr respective plates 30 for further security. This association may be through a peening operation or a braze or other technique. The retained nut 31 is preferably held captive in the plate 30 while allowing limited lateral and longitudinal movement of the nut 31 so as to align with the b»olt/screw. The retained nut 31 in accordance with the present invention may be formed as an integral part of the plate 30 or may be welded to that plate 30 as required. However, the retained nut 31 may also simply be held captive as an interference or compression fit between the welo portions 25 and other parts of the strip 22. The strip 22 in accordance with the present invention will as indicated above be generally ladder-like with the cross-forms 23 representing the notional treads in that ladder. Such an arrangement is structurally strong- It will be appreciated that where two parallel rows of retained nuts are required, a ladder disposed structure can be used in which cross parts are provided between longitudinal straps with lands created in those straps upon which retainers are secured by tangs . These retainers provide an anchor nut to which a bolt/screw for securing a first component to a second component is secured. Strips in accordance with the present invention are usually cut from sheet material using a laser- cutting technique in order to define the web portions, lip segments, grooves and tangs along with strip apertures etc . as required. The strip is then bent to form the uptiurned web portions and lip segments with the base plates located in the undercut slot during that bending process in order to capture and locate the base plate and so each retainer member. The web portions 25 have a width A depicted in. figure 3 to create ears which resist shear forces presented to a retained nut 31. The actual dimension of width A is determined by operational requirements and the material from which the collar strip 22 is made. It will also be understood that the ear or top edge of the web portions could be folded over to provide greater strength. The present arrangement 21 will be arranged as indicated about a second component to secure a first component to the second component, e.g. to secure a guide vane to a casing. These casings are generally cylindrical and so the strip will be required to form a ringg in use. This ring can be formed by butt welding ends of the strip together in order to create a band around thee casing. Alternatively, the associations between the retained nuts and bolts/screws for the vanes may be used. Thus, the strip may simply be presented to the casing so that bolts/screws protrude through and are secured to the retained nut with the strip gripped between them for retention. In such circumstances, the ends may simply be held adjacent each other or portions of the strip at the ends are overlapped. Furthermore, it will be appreciated that the ring formed about the casing may be a single length equivalent to the circumference of the casing or the ring created by a segment of strip brought into necessary association about the casing. Rather then depend upon the retained nut and bolt/screw to secure the nut retaining arrangement to the casing dedicated screws or rivets may be provided to fix the strip to the casing before the guide vanes are secured to the casing by the retained nut and bolt/screw to aid assembly. It will be understood that only a limited number of such screw or rivet fixings will be required in comparison with previous arrangements. By using retainer members 30 and apertures 35 it may be possible to provide that previous retainers which were secured by rivets through apertures 35 can now be secured through the tangs 36 formed in the collar strip 22. Thus, existing mechanisms for securing component mounting bolts/screws with reciprocal mating nuts associated with retainers may still be used but without the necessity of providing two rivets for each retainer. Although illustrated as substantially flat between cross-forms 23 it will be appreciated that in the forming or bending process ribs or other shaping of the strip profile could be provided to enhance buckle resistance and arrangement strength. The nut retaining arrangement of the present invention is used to fasten a first component to a second component . The first component may be a guide vane, an acoustic panel, an infill panel or a bracket of a gas turbine engine and the second component may be a casing of a gas turbine engine. Whilst endeavouring in the foregoing specification to draw attention to those features of the invention believed to be of particular importance it should be understood that the Applicant claims protection in respect of any patentable feature or combination of features hereinbefore referred to and/or shown in the drawings whether or not particular emphasis has been placed thereon.

Claims

Claims
I. A retainer arrangement (21) for retaining association between components, characterised in that the arrangement (21) comprises a strip (22) with cross—forms (23) and web portions (25) adjacent those cross-forms (23) to reinforce respective cross-forms (23) whereby the strip (22) is securable in use about a component with cross-forms (23) available to retain a nut (31) to prevent rotation. 2. An arrangement as claimed in claim 3_, wherein the strip (22) has a ladder configuration.
3. An arrangement as claimed in claim 1 or claim 2, wherein the strip (22) has shallow lips (26) between web portions (25) . 4. An arrangement as claimed in any of claims 1, 2 or 3, wherein grooves (27) are provided in the strip (22) to facilitate bending and conformity in use to the component .
5. An arrangement as claimed in any preceding claim, wherein the web portions (25) are bent ujwardly whereby they extend away from the component in use.
6. An arrangement as claimed in any preceding claim, wherein each cross-form (23) includes an anchor nut base plate (30) .
7. An arrangement as claimed in claim 6, wherein the base plate (30) is a plate or tag with means to prevent in use rotation of a nut (31) .
8. An arrangement as claimed in claim 6 or claim 7, wherein each base plate (30) is respectively located in at least one under-cut slot (33) formed in one of the web portions (25) . 9. An arrangement as claimed in any of claims 6 to 8 , wherein each base plate (30) is located and secured between under-cut slots (33) in adjacent web portions (25) . 10. An arrangement as claimed in any of claims 6 to 9, wherein each base plate (30) is secured by tangs (36) formed in the strip (22) .
II. An arrangement as claimed in clai_m 10, wherein these tangs (36) extending through apertures (35) in the base plate (30) .
12. An arrangement as claimed in claim 11 when dependent upon claim 6 and any claim dependent thereon, wherein the tangs (36) are bent-over in the apertuxes (35) .
13. An arrangement as claimed in claim 12, wherein the tangs (36) are associated with the base plate (30) .
14. An arrangement as claimed in claim 13, wherein that association is by brazing or peening .
15. An arrangement as claimed in any preceding claim, wherein ends of the strip (22) in us are secured together about the component to maintain as sociation between the arrangement and the component .
16. An arrangement as claimed in claim 15, wherein the ends of the strip (22) are butt welded together or the ends of the strip (22) overlap with overlapping cross-forms (23) whereby a retained nut (31) upon a bolt/screw will hold the ends together.
17. An arrangement as claimed in claim 15, wherein the arrangement depends in use upon associations between the nuts retained and bolt/screw to maintain association between the arrangement and the component.
18. An arrangement as claimed in any preceding claim wherein the arrangement secures the first component to a further component .
19. An arrangement as claimed in claim 18 wherein the component or the further component are a guide vane, a fan casing, an acoustic panel or an infill, panel.
20. A gas turbine engine guide vane assembly incorporating/ a retainer arrangement (21) as claimed in any preceding- claim. 21. A method of manufacturing a retainer arrangement (21) comprising cutting a strip (22) from sheet material, comprising cutting apertures (24) in the strip (22) to define cross-forms (23) and cutting the sheet material to define web portions (25) adjacent t?tιe cross-forms (23) to reinforce the cross- forms (23) .
22. A method as claimed in claim 21 comprising bending the web portions (25) upwardly.
23. A method as claimed in claim 21 or claim 22 comprising- cutting the sheet material to define shallow lip portions (26) between the web portions (25) , and grooves (27) between lip portions (26) .
24. A method as claimed in claim 23 comprising bending the lip portions (26) upwardly.
25. A method as claimed in any of claims 21 to 24 wherein the cutting comprises laser cutting.
PCT/GB2005/000294 2004-02-19 2005-01-28 Nut retaining WO2005080806A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB0403686A GB0403686D0 (en) 2004-02-19 2004-02-19 Nut retaining
GB0403686.9 2004-02-19

Publications (1)

Publication Number Publication Date
WO2005080806A1 true WO2005080806A1 (en) 2005-09-01

Family

ID=32040009

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2005/000294 WO2005080806A1 (en) 2004-02-19 2005-01-28 Nut retaining

Country Status (2)

Country Link
GB (1) GB0403686D0 (en)
WO (1) WO2005080806A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US385442A (en) * 1888-07-03 Mut-lock
US716085A (en) * 1901-11-21 1902-12-16 Cuthbert W Ridley Nut-lock.
GB1411299A (en) * 1973-04-10 1975-10-22 Rolls Royce Anti-rotation washers for flanged or round headed screwed fastenings
US4887949A (en) * 1988-03-30 1989-12-19 United Technologies Corporation Bolt retention apparatus
FR2807122A1 (en) * 2000-03-29 2001-10-05 Gobin Daude Mounting device for attachment to car side frame comprises mounting plate with apertures containing flexible claws which cooperate with grooves on head of bolts inserted in apertures

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US385442A (en) * 1888-07-03 Mut-lock
US716085A (en) * 1901-11-21 1902-12-16 Cuthbert W Ridley Nut-lock.
GB1411299A (en) * 1973-04-10 1975-10-22 Rolls Royce Anti-rotation washers for flanged or round headed screwed fastenings
US4887949A (en) * 1988-03-30 1989-12-19 United Technologies Corporation Bolt retention apparatus
FR2807122A1 (en) * 2000-03-29 2001-10-05 Gobin Daude Mounting device for attachment to car side frame comprises mounting plate with apertures containing flexible claws which cooperate with grooves on head of bolts inserted in apertures

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Also Published As

Publication number Publication date
GB0403686D0 (en) 2004-03-24

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